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To Determine the Concenteration of a Limewater Solution

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To Determine the Concentration of a Limewater Solution The aim of this investigation is to determine the concentration of a limewater solution using hydrochloric acid with a known concentration of 2.00mol dm-3. In this investigation, I will be using titration to determine the concentration of the limewater solution. "Titration is a way of measuring quantities of reactants, and can be very useful in determining an unknown concentration."i But before I can undergo the titration, I will need to dilute the hydrochloric acid. This is because the limewater has an approximate concentration of 1g dm-3, whereas the hydrochloric acid has a concentration of 2.00mol dm-3. This is important because if the hydrochloric acid has a higher concentration than the limewater, then not all of the solution will neutralise fully, which will not give us accurate or reliable results. Before the titration, I will also have to work out which indicator should be used in this experiment. The indicator is essential as it shows the end-point where the entire base has reacted to give a neutral solution. As both hydrochloric acid and calcium hydroxide are strong basesii iii, I have a choice of using either methyl orange or phenolphthalein as my indicators. ...read more.


This is done to ensure that the correct volume of HCl is obtained so the results will be accurate. After that, empty the pipette into the flask and fill the flask up to its 250cm3 fill line using the distilled water. Again making sure that the bottom of the meniscus is in line with the file line. Now with the stopper on, give the flask a good shake, turning upside down and backup to ensure all of the solution is mixed and the correct concentration is obtained. Empty out the solution from the flask into the beaker. The solution is now diluted down to 0.2 mol dm-3. Rinse the flask with distilled water to ensure no traces of the solution are left. Then using the pipette again, collect 25cm3 of the diluted HCl solution from the beaker and empty it in the flask. Now again I need to fill the flask upto 250cm3 line by adding distilled water and the with the lid on, shake the flask. Now empty out the beaker and rinse it with distilled water and transfer this newly diluted solution into the beaker. ...read more.


After that, using the balanced chemical equation, I will be able to determine the actual concentration of the limewater solution. Accuracy of the Equipment: * The 25cm3 pipette has an uncertainty of 0.04cm3 which isn't that significant so it won't affect the accuracy of the results significantly. * The 50cm3 Grade B Burette has an uncertainty of 0.08cm3 which again will not affect the results significantly. * The 250cm3 volumetric flask has an uncertainty of 0.02cm3 which is a very minor value and will not affect the accuracy of the results. Safety Precautions * Must wear safety goggles when near any chemicals. * Hydrochloric acid is toxic and corrosive. * Limewater is Corrosive. Care must be taken when handling it.v * Keep the work area safe and tidy; when equipment is no longer required, move it aside or clear it away. * Do avoid spillage; ensure the burette tap is closed before filling and use a funnel. * Remove the funnel from the burette when not in use, this could cause a hazard and any chemicals dripping off the funnel into the burette will cause inaccurate results. * Wash out all equipment before and after use to remove all traces of chemicals which could cause errors in the experiment. ...read more.

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